import {
  AmbientLight,
  AnimationClip,
  Bone,
  BufferGeometry,
  ClampToEdgeWrapping,
  Color,
  DirectionalLight,
  DoubleSide,
  Euler,
  FileLoader,
  Float32BufferAttribute,
  Group,
  Line,
  LineBasicMaterial,
  LineSegments,
  Loader,
  LoaderUtils,
  MathUtils,
  Matrix4,
  Mesh,
  MeshBasicMaterial,
  MeshLambertMaterial,
  MeshPhongMaterial,
  OrthographicCamera,
  PerspectiveCamera,
  PointLight,
  Quaternion,
  QuaternionKeyframeTrack,
  RepeatWrapping,
  Scene,
  Skeleton,
  SkinnedMesh,
  SpotLight,
  TextureLoader,
  Vector3,
  VectorKeyframeTrack
} from "../../build/three.module.js";
import {TGALoader} from "../loaders/TGALoader.js";

var ColladaLoader = function (manager) {

  Loader.call(this, manager);

};

ColladaLoader.prototype = Object.assign(Object.create(Loader.prototype), {

  constructor: ColladaLoader,

  load: function (url, onLoad, onProgress, onError) {

    var scope = this;

    var path = (scope.path === '') ? LoaderUtils.extractUrlBase(url) : scope.path;

    var loader = new FileLoader(scope.manager);
    loader.setPath(scope.path);
    loader.setRequestHeader(scope.requestHeader);
    loader.setWithCredentials(scope.withCredentials);
    loader.load(url, function (text) {

      try {

        onLoad(scope.parse(text, path));

      } catch (e) {

        if (onError) {

          onError(e);

        } else {

          console.error(e);

        }

        scope.manager.itemError(url);

      }

    }, onProgress, onError);

  },

  options: {

    set convertUpAxis(value) {

      console.warn('THREE.ColladaLoader: options.convertUpAxis() has been removed. Up axis is converted automatically.');

    }

  },

  parse: function (text, path) {

    function getElementsByTagName(xml, name) {

      // Non recursive xml.getElementsByTagName() ...

      var array = [];
      var childNodes = xml.childNodes;

      for (var i = 0, l = childNodes.length; i < l; i++) {

        var child = childNodes[i];

        if (child.nodeName === name) {

          array.push(child);

        }

      }

      return array;

    }

    function parseStrings(text) {

      if (text.length === 0) return [];

      var parts = text.trim().split(/\s+/);
      var array = new Array(parts.length);

      for (var i = 0, l = parts.length; i < l; i++) {

        array[i] = parts[i];

      }

      return array;

    }

    function parseFloats(text) {

      if (text.length === 0) return [];

      var parts = text.trim().split(/\s+/);
      var array = new Array(parts.length);

      for (var i = 0, l = parts.length; i < l; i++) {

        array[i] = parseFloat(parts[i]);

      }

      return array;

    }

    function parseInts(text) {

      if (text.length === 0) return [];

      var parts = text.trim().split(/\s+/);
      var array = new Array(parts.length);

      for (var i = 0, l = parts.length; i < l; i++) {

        array[i] = parseInt(parts[i]);

      }

      return array;

    }

    function parseId(text) {

      return text.substring(1);

    }

    function generateId() {

      return 'three_default_' + (count++);

    }

    function isEmpty(object) {

      return Object.keys(object).length === 0;

    }

    // asset

    function parseAsset(xml) {

      return {
        unit: parseAssetUnit(getElementsByTagName(xml, 'unit')[0]),
        upAxis: parseAssetUpAxis(getElementsByTagName(xml, 'up_axis')[0])
      };

    }

    function parseAssetUnit(xml) {

      if ((xml !== undefined) && (xml.hasAttribute('meter') === true)) {

        return parseFloat(xml.getAttribute('meter'));

      } else {

        return 1; // default 1 meter

      }

    }

    function parseAssetUpAxis(xml) {

      return xml !== undefined ? xml.textContent : 'Y_UP';

    }

    // library

    function parseLibrary(xml, libraryName, nodeName, parser) {

      var library = getElementsByTagName(xml, libraryName)[0];

      if (library !== undefined) {

        var elements = getElementsByTagName(library, nodeName);

        for (var i = 0; i < elements.length; i++) {

          parser(elements[i]);

        }

      }

    }

    function buildLibrary(data, builder) {

      for (var name in data) {

        var object = data[name];
        object.build = builder(data[name]);

      }

    }

    // get

    function getBuild(data, builder) {

      if (data.build !== undefined) return data.build;

      data.build = builder(data);

      return data.build;

    }

    // animation

    function parseAnimation(xml) {

      var data = {
        sources: {},
        samplers: {},
        channels: {}
      };

      var hasChildren = false;

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        var id;

        switch (child.nodeName) {

          case 'source':
            id = child.getAttribute('id');
            data.sources[id] = parseSource(child);
            break;

          case 'sampler':
            id = child.getAttribute('id');
            data.samplers[id] = parseAnimationSampler(child);
            break;

          case 'channel':
            id = child.getAttribute('target');
            data.channels[id] = parseAnimationChannel(child);
            break;

          case 'animation':
            // hierarchy of related animations
            parseAnimation(child);
            hasChildren = true;
            break;

          default:
            console.log(child);

        }

      }

      if (hasChildren === false) {

        // since 'id' attributes can be optional, it's necessary to generate a UUID for unqiue assignment

        library.animations[xml.getAttribute('id') || MathUtils.generateUUID()] = data;

      }

    }

    function parseAnimationSampler(xml) {

      var data = {
        inputs: {},
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'input':
            var id = parseId(child.getAttribute('source'));
            var semantic = child.getAttribute('semantic');
            data.inputs[semantic] = id;
            break;

        }

      }

      return data;

    }

    function parseAnimationChannel(xml) {

      var data = {};

      var target = xml.getAttribute('target');

      // parsing SID Addressing Syntax

      var parts = target.split('/');

      var id = parts.shift();
      var sid = parts.shift();

      // check selection syntax

      var arraySyntax = (sid.indexOf('(') !== -1);
      var memberSyntax = (sid.indexOf('.') !== -1);

      if (memberSyntax) {

        //  member selection access

        parts = sid.split('.');
        sid = parts.shift();
        data.member = parts.shift();

      } else if (arraySyntax) {

        // array-access syntax. can be used to express fields in one-dimensional vectors or two-dimensional matrices.

        var indices = sid.split('(');
        sid = indices.shift();

        for (var i = 0; i < indices.length; i++) {

          indices[i] = parseInt(indices[i].replace(/\)/, ''));

        }

        data.indices = indices;

      }

      data.id = id;
      data.sid = sid;

      data.arraySyntax = arraySyntax;
      data.memberSyntax = memberSyntax;

      data.sampler = parseId(xml.getAttribute('source'));

      return data;

    }

    function buildAnimation(data) {

      var tracks = [];

      var channels = data.channels;
      var samplers = data.samplers;
      var sources = data.sources;

      for (var target in channels) {

        if (channels.hasOwnProperty(target)) {

          var channel = channels[target];
          var sampler = samplers[channel.sampler];

          var inputId = sampler.inputs.INPUT;
          var outputId = sampler.inputs.OUTPUT;

          var inputSource = sources[inputId];
          var outputSource = sources[outputId];

          var animation = buildAnimationChannel(channel, inputSource, outputSource);

          createKeyframeTracks(animation, tracks);

        }

      }

      return tracks;

    }

    function getAnimation(id) {

      return getBuild(library.animations[id], buildAnimation);

    }

    function buildAnimationChannel(channel, inputSource, outputSource) {

      var node = library.nodes[channel.id];
      var object3D = getNode(node.id);

      var transform = node.transforms[channel.sid];
      var defaultMatrix = node.matrix.clone().transpose();

      var time, stride;
      var i, il, j, jl;

      var data = {};

      // the collada spec allows the animation of data in various ways.
      // depending on the transform type (matrix, translate, rotate, scale), we execute different logic

      switch (transform) {

        case 'matrix':

          for (i = 0, il = inputSource.array.length; i < il; i++) {

            time = inputSource.array[i];
            stride = i * outputSource.stride;

            if (data[time] === undefined) data[time] = {};

            if (channel.arraySyntax === true) {

              var value = outputSource.array[stride];
              var index = channel.indices[0] + 4 * channel.indices[1];

              data[time][index] = value;

            } else {

              for (j = 0, jl = outputSource.stride; j < jl; j++) {

                data[time][j] = outputSource.array[stride + j];

              }

            }

          }

          break;

        case 'translate':
          console.warn('THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform);
          break;

        case 'rotate':
          console.warn('THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform);
          break;

        case 'scale':
          console.warn('THREE.ColladaLoader: Animation transform type "%s" not yet implemented.', transform);
          break;

      }

      var keyframes = prepareAnimationData(data, defaultMatrix);

      var animation = {
        name: object3D.uuid,
        keyframes: keyframes
      };

      return animation;

    }

    function prepareAnimationData(data, defaultMatrix) {

      var keyframes = [];

      // transfer data into a sortable array

      for (var time in data) {

        keyframes.push({time: parseFloat(time), value: data[time]});

      }

      // ensure keyframes are sorted by time

      keyframes.sort(ascending);

      // now we clean up all animation data, so we can use them for keyframe tracks

      for (var i = 0; i < 16; i++) {

        transformAnimationData(keyframes, i, defaultMatrix.elements[i]);

      }

      return keyframes;

      // array sort function

      function ascending(a, b) {

        return a.time - b.time;

      }

    }

    var position = new Vector3();
    var scale = new Vector3();
    var quaternion = new Quaternion();

    function createKeyframeTracks(animation, tracks) {

      var keyframes = animation.keyframes;
      var name = animation.name;

      var times = [];
      var positionData = [];
      var quaternionData = [];
      var scaleData = [];

      for (var i = 0, l = keyframes.length; i < l; i++) {

        var keyframe = keyframes[i];

        var time = keyframe.time;
        var value = keyframe.value;

        matrix.fromArray(value).transpose();
        matrix.decompose(position, quaternion, scale);

        times.push(time);
        positionData.push(position.x, position.y, position.z);
        quaternionData.push(quaternion.x, quaternion.y, quaternion.z, quaternion.w);
        scaleData.push(scale.x, scale.y, scale.z);

      }

      if (positionData.length > 0) tracks.push(new VectorKeyframeTrack(name + '.position', times, positionData));
      if (quaternionData.length > 0) tracks.push(new QuaternionKeyframeTrack(name + '.quaternion', times, quaternionData));
      if (scaleData.length > 0) tracks.push(new VectorKeyframeTrack(name + '.scale', times, scaleData));

      return tracks;

    }

    function transformAnimationData(keyframes, property, defaultValue) {

      var keyframe;

      var empty = true;
      var i, l;

      // check, if values of a property are missing in our keyframes

      for (i = 0, l = keyframes.length; i < l; i++) {

        keyframe = keyframes[i];

        if (keyframe.value[property] === undefined) {

          keyframe.value[property] = null; // mark as missing

        } else {

          empty = false;

        }

      }

      if (empty === true) {

        // no values at all, so we set a default value

        for (i = 0, l = keyframes.length; i < l; i++) {

          keyframe = keyframes[i];

          keyframe.value[property] = defaultValue;

        }

      } else {

        // filling gaps

        createMissingKeyframes(keyframes, property);

      }

    }

    function createMissingKeyframes(keyframes, property) {

      var prev, next;

      for (var i = 0, l = keyframes.length; i < l; i++) {

        var keyframe = keyframes[i];

        if (keyframe.value[property] === null) {

          prev = getPrev(keyframes, i, property);
          next = getNext(keyframes, i, property);

          if (prev === null) {

            keyframe.value[property] = next.value[property];
            continue;

          }

          if (next === null) {

            keyframe.value[property] = prev.value[property];
            continue;

          }

          interpolate(keyframe, prev, next, property);

        }

      }

    }

    function getPrev(keyframes, i, property) {

      while (i >= 0) {

        var keyframe = keyframes[i];

        if (keyframe.value[property] !== null) return keyframe;

        i--;

      }

      return null;

    }

    function getNext(keyframes, i, property) {

      while (i < keyframes.length) {

        var keyframe = keyframes[i];

        if (keyframe.value[property] !== null) return keyframe;

        i++;

      }

      return null;

    }

    function interpolate(key, prev, next, property) {

      if ((next.time - prev.time) === 0) {

        key.value[property] = prev.value[property];
        return;

      }

      key.value[property] = ((key.time - prev.time) * (next.value[property] - prev.value[property]) / (next.time - prev.time)) + prev.value[property];

    }

    // animation clips

    function parseAnimationClip(xml) {

      var data = {
        name: xml.getAttribute('id') || 'default',
        start: parseFloat(xml.getAttribute('start') || 0),
        end: parseFloat(xml.getAttribute('end') || 0),
        animations: []
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'instance_animation':
            data.animations.push(parseId(child.getAttribute('url')));
            break;

        }

      }

      library.clips[xml.getAttribute('id')] = data;

    }

    function buildAnimationClip(data) {

      var tracks = [];

      var name = data.name;
      var duration = (data.end - data.start) || -1;
      var animations = data.animations;

      for (var i = 0, il = animations.length; i < il; i++) {

        var animationTracks = getAnimation(animations[i]);

        for (var j = 0, jl = animationTracks.length; j < jl; j++) {

          tracks.push(animationTracks[j]);

        }

      }

      return new AnimationClip(name, duration, tracks);

    }

    function getAnimationClip(id) {

      return getBuild(library.clips[id], buildAnimationClip);

    }

    // controller

    function parseController(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'skin':
            // there is exactly one skin per controller
            data.id = parseId(child.getAttribute('source'));
            data.skin = parseSkin(child);
            break;

          case 'morph':
            data.id = parseId(child.getAttribute('source'));
            console.warn('THREE.ColladaLoader: Morph target animation not supported yet.');
            break;

        }

      }

      library.controllers[xml.getAttribute('id')] = data;

    }

    function parseSkin(xml) {

      var data = {
        sources: {}
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'bind_shape_matrix':
            data.bindShapeMatrix = parseFloats(child.textContent);
            break;

          case 'source':
            var id = child.getAttribute('id');
            data.sources[id] = parseSource(child);
            break;

          case 'joints':
            data.joints = parseJoints(child);
            break;

          case 'vertex_weights':
            data.vertexWeights = parseVertexWeights(child);
            break;

        }

      }

      return data;

    }

    function parseJoints(xml) {

      var data = {
        inputs: {}
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'input':
            var semantic = child.getAttribute('semantic');
            var id = parseId(child.getAttribute('source'));
            data.inputs[semantic] = id;
            break;

        }

      }

      return data;

    }

    function parseVertexWeights(xml) {

      var data = {
        inputs: {}
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'input':
            var semantic = child.getAttribute('semantic');
            var id = parseId(child.getAttribute('source'));
            var offset = parseInt(child.getAttribute('offset'));
            data.inputs[semantic] = {id: id, offset: offset};
            break;

          case 'vcount':
            data.vcount = parseInts(child.textContent);
            break;

          case 'v':
            data.v = parseInts(child.textContent);
            break;

        }

      }

      return data;

    }

    function buildController(data) {

      var build = {
        id: data.id
      };

      var geometry = library.geometries[build.id];

      if (data.skin !== undefined) {

        build.skin = buildSkin(data.skin);

        // we enhance the 'sources' property of the corresponding geometry with our skin data

        geometry.sources.skinIndices = build.skin.indices;
        geometry.sources.skinWeights = build.skin.weights;

      }

      return build;

    }

    function buildSkin(data) {

      var BONE_LIMIT = 4;

      var build = {
        joints: [], // this must be an array to preserve the joint order
        indices: {
          array: [],
          stride: BONE_LIMIT
        },
        weights: {
          array: [],
          stride: BONE_LIMIT
        }
      };

      var sources = data.sources;
      var vertexWeights = data.vertexWeights;

      var vcount = vertexWeights.vcount;
      var v = vertexWeights.v;
      var jointOffset = vertexWeights.inputs.JOINT.offset;
      var weightOffset = vertexWeights.inputs.WEIGHT.offset;

      var jointSource = data.sources[data.joints.inputs.JOINT];
      var inverseSource = data.sources[data.joints.inputs.INV_BIND_MATRIX];

      var weights = sources[vertexWeights.inputs.WEIGHT.id].array;
      var stride = 0;

      var i, j, l;

      // procces skin data for each vertex

      for (i = 0, l = vcount.length; i < l; i++) {

        var jointCount = vcount[i]; // this is the amount of joints that affect a single vertex
        var vertexSkinData = [];

        for (j = 0; j < jointCount; j++) {

          var skinIndex = v[stride + jointOffset];
          var weightId = v[stride + weightOffset];
          var skinWeight = weights[weightId];

          vertexSkinData.push({index: skinIndex, weight: skinWeight});

          stride += 2;

        }

        // we sort the joints in descending order based on the weights.
        // this ensures, we only procced the most important joints of the vertex

        vertexSkinData.sort(descending);

        // now we provide for each vertex a set of four index and weight values.
        // the order of the skin data matches the order of vertices

        for (j = 0; j < BONE_LIMIT; j++) {

          var d = vertexSkinData[j];

          if (d !== undefined) {

            build.indices.array.push(d.index);
            build.weights.array.push(d.weight);

          } else {

            build.indices.array.push(0);
            build.weights.array.push(0);

          }

        }

      }

      // setup bind matrix

      if (data.bindShapeMatrix) {

        build.bindMatrix = new Matrix4().fromArray(data.bindShapeMatrix).transpose();

      } else {

        build.bindMatrix = new Matrix4().identity();

      }

      // process bones and inverse bind matrix data

      for (i = 0, l = jointSource.array.length; i < l; i++) {

        var name = jointSource.array[i];
        var boneInverse = new Matrix4().fromArray(inverseSource.array, i * inverseSource.stride).transpose();

        build.joints.push({name: name, boneInverse: boneInverse});

      }

      return build;

      // array sort function

      function descending(a, b) {

        return b.weight - a.weight;

      }

    }

    function getController(id) {

      return getBuild(library.controllers[id], buildController);

    }

    // image

    function parseImage(xml) {

      var data = {
        init_from: getElementsByTagName(xml, 'init_from')[0].textContent
      };

      library.images[xml.getAttribute('id')] = data;

    }

    function buildImage(data) {

      if (data.build !== undefined) return data.build;

      return data.init_from;

    }

    function getImage(id) {

      var data = library.images[id];

      if (data !== undefined) {

        return getBuild(data, buildImage);

      }

      console.warn('THREE.ColladaLoader: Couldn\'t find image with ID:', id);

      return null;

    }

    // effect

    function parseEffect(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'profile_COMMON':
            data.profile = parseEffectProfileCOMMON(child);
            break;

        }

      }

      library.effects[xml.getAttribute('id')] = data;

    }

    function parseEffectProfileCOMMON(xml) {

      var data = {
        surfaces: {},
        samplers: {}
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'newparam':
            parseEffectNewparam(child, data);
            break;

          case 'technique':
            data.technique = parseEffectTechnique(child);
            break;

          case 'extra':
            data.extra = parseEffectExtra(child);
            break;

        }

      }

      return data;

    }

    function parseEffectNewparam(xml, data) {

      var sid = xml.getAttribute('sid');

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'surface':
            data.surfaces[sid] = parseEffectSurface(child);
            break;

          case 'sampler2D':
            data.samplers[sid] = parseEffectSampler(child);
            break;

        }

      }

    }

    function parseEffectSurface(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'init_from':
            data.init_from = child.textContent;
            break;

        }

      }

      return data;

    }

    function parseEffectSampler(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'source':
            data.source = child.textContent;
            break;

        }

      }

      return data;

    }

    function parseEffectTechnique(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'constant':
          case 'lambert':
          case 'blinn':
          case 'phong':
            data.type = child.nodeName;
            data.parameters = parseEffectParameters(child);
            break;

        }

      }

      return data;

    }

    function parseEffectParameters(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'emission':
          case 'diffuse':
          case 'specular':
          case 'bump':
          case 'ambient':
          case 'shininess':
          case 'transparency':
            data[child.nodeName] = parseEffectParameter(child);
            break;
          case 'transparent':
            data[child.nodeName] = {
              opaque: child.getAttribute('opaque'),
              data: parseEffectParameter(child)
            };
            break;

        }

      }

      return data;

    }

    function parseEffectParameter(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'color':
            data[child.nodeName] = parseFloats(child.textContent);
            break;

          case 'float':
            data[child.nodeName] = parseFloat(child.textContent);
            break;

          case 'texture':
            data[child.nodeName] = {id: child.getAttribute('texture'), extra: parseEffectParameterTexture(child)};
            break;

        }

      }

      return data;

    }

    function parseEffectParameterTexture(xml) {

      var data = {
        technique: {}
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'extra':
            parseEffectParameterTextureExtra(child, data);
            break;

        }

      }

      return data;

    }

    function parseEffectParameterTextureExtra(xml, data) {

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'technique':
            parseEffectParameterTextureExtraTechnique(child, data);
            break;

        }

      }

    }

    function parseEffectParameterTextureExtraTechnique(xml, data) {

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'repeatU':
          case 'repeatV':
          case 'offsetU':
          case 'offsetV':
            data.technique[child.nodeName] = parseFloat(child.textContent);
            break;

          case 'wrapU':
          case 'wrapV':

            // some files have values for wrapU/wrapV which become NaN via parseInt

            if (child.textContent.toUpperCase() === 'TRUE') {

              data.technique[child.nodeName] = 1;

            } else if (child.textContent.toUpperCase() === 'FALSE') {

              data.technique[child.nodeName] = 0;

            } else {

              data.technique[child.nodeName] = parseInt(child.textContent);

            }

            break;

        }

      }

    }

    function parseEffectExtra(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'technique':
            data.technique = parseEffectExtraTechnique(child);
            break;

        }

      }

      return data;

    }

    function parseEffectExtraTechnique(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'double_sided':
            data[child.nodeName] = parseInt(child.textContent);
            break;

        }

      }

      return data;

    }

    function buildEffect(data) {

      return data;

    }

    function getEffect(id) {

      return getBuild(library.effects[id], buildEffect);

    }

    // material

    function parseMaterial(xml) {

      var data = {
        name: xml.getAttribute('name')
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'instance_effect':
            data.url = parseId(child.getAttribute('url'));
            break;

        }

      }

      library.materials[xml.getAttribute('id')] = data;

    }

    function getTextureLoader(image) {

      var loader;

      var extension = image.slice((image.lastIndexOf('.') - 1 >>> 0) + 2); // http://www.jstips.co/en/javascript/get-file-extension/
      extension = extension.toLowerCase();

      switch (extension) {

        case 'tga':
          loader = tgaLoader;
          break;

        default:
          loader = textureLoader;

      }

      return loader;

    }

    function buildMaterial(data) {

      var effect = getEffect(data.url);
      var technique = effect.profile.technique;
      var extra = effect.profile.extra;

      var material;

      switch (technique.type) {

        case 'phong':
        case 'blinn':
          material = new MeshPhongMaterial();
          break;

        case 'lambert':
          material = new MeshLambertMaterial();
          break;

        default:
          material = new MeshBasicMaterial();
          break;

      }

      material.name = data.name || '';

      function getTexture(textureObject) {

        var sampler = effect.profile.samplers[textureObject.id];
        var image = null;

        // get image

        if (sampler !== undefined) {

          var surface = effect.profile.surfaces[sampler.source];
          image = getImage(surface.init_from);

        } else {

          console.warn('THREE.ColladaLoader: Undefined sampler. Access image directly (see #12530).');
          image = getImage(textureObject.id);

        }

        // create texture if image is avaiable

        if (image !== null) {

          var loader = getTextureLoader(image);

          if (loader !== undefined) {

            var texture = loader.load(image);

            var extra = textureObject.extra;

            if (extra !== undefined && extra.technique !== undefined && isEmpty(extra.technique) === false) {

              var technique = extra.technique;

              texture.wrapS = technique.wrapU ? RepeatWrapping : ClampToEdgeWrapping;
              texture.wrapT = technique.wrapV ? RepeatWrapping : ClampToEdgeWrapping;

              texture.offset.set(technique.offsetU || 0, technique.offsetV || 0);
              texture.repeat.set(technique.repeatU || 1, technique.repeatV || 1);

            } else {

              texture.wrapS = RepeatWrapping;
              texture.wrapT = RepeatWrapping;

            }

            return texture;

          } else {

            console.warn('THREE.ColladaLoader: Loader for texture %s not found.', image);

            return null;

          }

        } else {

          console.warn('THREE.ColladaLoader: Couldn\'t create texture with ID:', textureObject.id);

          return null;

        }

      }

      var parameters = technique.parameters;

      for (var key in parameters) {

        var parameter = parameters[key];

        switch (key) {

          case 'diffuse':
            if (parameter.color) material.color.fromArray(parameter.color);
            if (parameter.texture) material.map = getTexture(parameter.texture);
            break;
          case 'specular':
            if (parameter.color && material.specular) material.specular.fromArray(parameter.color);
            if (parameter.texture) material.specularMap = getTexture(parameter.texture);
            break;
          case 'bump':
            if (parameter.texture) material.normalMap = getTexture(parameter.texture);
            break;
          case 'ambient':
            if (parameter.texture) material.lightMap = getTexture(parameter.texture);
            break;
          case 'shininess':
            if (parameter.float && material.shininess) material.shininess = parameter.float;
            break;
          case 'emission':
            if (parameter.color && material.emissive) material.emissive.fromArray(parameter.color);
            if (parameter.texture) material.emissiveMap = getTexture(parameter.texture);
            break;

        }

      }

      //

      var transparent = parameters['transparent'];
      var transparency = parameters['transparency'];

      // <transparency> does not exist but <transparent>

      if (transparency === undefined && transparent) {

        transparency = {
          float: 1
        };

      }

      // <transparent> does not exist but <transparency>

      if (transparent === undefined && transparency) {

        transparent = {
          opaque: 'A_ONE',
          data: {
            color: [1, 1, 1, 1]
          }
        };

      }

      if (transparent && transparency) {

        // handle case if a texture exists but no color

        if (transparent.data.texture) {

          // we do not set an alpha map (see #13792)

          material.transparent = true;

        } else {

          var color = transparent.data.color;

          switch (transparent.opaque) {

            case 'A_ONE':
              material.opacity = color[3] * transparency.float;
              break;
            case 'RGB_ZERO':
              material.opacity = 1 - (color[0] * transparency.float);
              break;
            case 'A_ZERO':
              material.opacity = 1 - (color[3] * transparency.float);
              break;
            case 'RGB_ONE':
              material.opacity = color[0] * transparency.float;
              break;
            default:
              console.warn('THREE.ColladaLoader: Invalid opaque type "%s" of transparent tag.', transparent.opaque);

          }

          if (material.opacity < 1) material.transparent = true;

        }

      }

      //

      if (extra !== undefined && extra.technique !== undefined && extra.technique.double_sided === 1) {

        material.side = DoubleSide;

      }

      return material;

    }

    function getMaterial(id) {

      return getBuild(library.materials[id], buildMaterial);

    }

    // camera

    function parseCamera(xml) {

      var data = {
        name: xml.getAttribute('name')
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'optics':
            data.optics = parseCameraOptics(child);
            break;

        }

      }

      library.cameras[xml.getAttribute('id')] = data;

    }

    function parseCameraOptics(xml) {

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        switch (child.nodeName) {

          case 'technique_common':
            return parseCameraTechnique(child);

        }

      }

      return {};

    }

    function parseCameraTechnique(xml) {

      var data = {};

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        switch (child.nodeName) {

          case 'perspective':
          case 'orthographic':

            data.technique = child.nodeName;
            data.parameters = parseCameraParameters(child);

            break;

        }

      }

      return data;

    }

    function parseCameraParameters(xml) {

      var data = {};

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        switch (child.nodeName) {

          case 'xfov':
          case 'yfov':
          case 'xmag':
          case 'ymag':
          case 'znear':
          case 'zfar':
          case 'aspect_ratio':
            data[child.nodeName] = parseFloat(child.textContent);
            break;

        }

      }

      return data;

    }

    function buildCamera(data) {

      var camera;

      switch (data.optics.technique) {

        case 'perspective':
          camera = new PerspectiveCamera(
            data.optics.parameters.yfov,
            data.optics.parameters.aspect_ratio,
            data.optics.parameters.znear,
            data.optics.parameters.zfar
          );
          break;

        case 'orthographic':
          var ymag = data.optics.parameters.ymag;
          var xmag = data.optics.parameters.xmag;
          var aspectRatio = data.optics.parameters.aspect_ratio;

          xmag = (xmag === undefined) ? (ymag * aspectRatio) : xmag;
          ymag = (ymag === undefined) ? (xmag / aspectRatio) : ymag;

          xmag *= 0.5;
          ymag *= 0.5;

          camera = new OrthographicCamera(
            -xmag, xmag, ymag, -ymag, // left, right, top, bottom
            data.optics.parameters.znear,
            data.optics.parameters.zfar
          );
          break;

        default:
          camera = new PerspectiveCamera();
          break;

      }

      camera.name = data.name || '';

      return camera;

    }

    function getCamera(id) {

      var data = library.cameras[id];

      if (data !== undefined) {

        return getBuild(data, buildCamera);

      }

      console.warn('THREE.ColladaLoader: Couldn\'t find camera with ID:', id);

      return null;

    }

    // light

    function parseLight(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'technique_common':
            data = parseLightTechnique(child);
            break;

        }

      }

      library.lights[xml.getAttribute('id')] = data;

    }

    function parseLightTechnique(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'directional':
          case 'point':
          case 'spot':
          case 'ambient':

            data.technique = child.nodeName;
            data.parameters = parseLightParameters(child);

        }

      }

      return data;

    }

    function parseLightParameters(xml) {

      var data = {};

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'color':
            var array = parseFloats(child.textContent);
            data.color = new Color().fromArray(array);
            break;

          case 'falloff_angle':
            data.falloffAngle = parseFloat(child.textContent);
            break;

          case 'quadratic_attenuation':
            var f = parseFloat(child.textContent);
            data.distance = f ? Math.sqrt(1 / f) : 0;
            break;

        }

      }

      return data;

    }

    function buildLight(data) {

      var light;

      switch (data.technique) {

        case 'directional':
          light = new DirectionalLight();
          break;

        case 'point':
          light = new PointLight();
          break;

        case 'spot':
          light = new SpotLight();
          break;

        case 'ambient':
          light = new AmbientLight();
          break;

      }

      if (data.parameters.color) light.color.copy(data.parameters.color);
      if (data.parameters.distance) light.distance = data.parameters.distance;

      return light;

    }

    function getLight(id) {

      var data = library.lights[id];

      if (data !== undefined) {

        return getBuild(data, buildLight);

      }

      console.warn('THREE.ColladaLoader: Couldn\'t find light with ID:', id);

      return null;

    }

    // geometry

    function parseGeometry(xml) {

      var data = {
        name: xml.getAttribute('name'),
        sources: {},
        vertices: {},
        primitives: []
      };

      var mesh = getElementsByTagName(xml, 'mesh')[0];

      // the following tags inside geometry are not supported yet (see https://github.com/mrdoob/three.js/pull/12606): convex_mesh, spline, brep
      if (mesh === undefined) return;

      for (var i = 0; i < mesh.childNodes.length; i++) {

        var child = mesh.childNodes[i];

        if (child.nodeType !== 1) continue;

        var id = child.getAttribute('id');

        switch (child.nodeName) {

          case 'source':
            data.sources[id] = parseSource(child);
            break;

          case 'vertices':
            // data.sources[ id ] = data.sources[ parseId( getElementsByTagName( child, 'input' )[ 0 ].getAttribute( 'source' ) ) ];
            data.vertices = parseGeometryVertices(child);
            break;

          case 'polygons':
            console.warn('THREE.ColladaLoader: Unsupported primitive type: ', child.nodeName);
            break;

          case 'lines':
          case 'linestrips':
          case 'polylist':
          case 'triangles':
            data.primitives.push(parseGeometryPrimitive(child));
            break;

          default:
            console.log(child);

        }

      }

      library.geometries[xml.getAttribute('id')] = data;

    }

    function parseSource(xml) {

      var data = {
        array: [],
        stride: 3
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'float_array':
            data.array = parseFloats(child.textContent);
            break;

          case 'Name_array':
            data.array = parseStrings(child.textContent);
            break;

          case 'technique_common':
            var accessor = getElementsByTagName(child, 'accessor')[0];

            if (accessor !== undefined) {

              data.stride = parseInt(accessor.getAttribute('stride'));

            }

            break;

        }

      }

      return data;

    }

    function parseGeometryVertices(xml) {

      var data = {};

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        data[child.getAttribute('semantic')] = parseId(child.getAttribute('source'));

      }

      return data;

    }

    function parseGeometryPrimitive(xml) {

      var primitive = {
        type: xml.nodeName,
        material: xml.getAttribute('material'),
        count: parseInt(xml.getAttribute('count')),
        inputs: {},
        stride: 0,
        hasUV: false
      };

      for (var i = 0, l = xml.childNodes.length; i < l; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'input':
            var id = parseId(child.getAttribute('source'));
            var semantic = child.getAttribute('semantic');
            var offset = parseInt(child.getAttribute('offset'));
            var set = parseInt(child.getAttribute('set'));
            var inputname = (set > 0 ? semantic + set : semantic);
            primitive.inputs[inputname] = {id: id, offset: offset};
            primitive.stride = Math.max(primitive.stride, offset + 1);
            if (semantic === 'TEXCOORD') primitive.hasUV = true;
            break;

          case 'vcount':
            primitive.vcount = parseInts(child.textContent);
            break;

          case 'p':
            primitive.p = parseInts(child.textContent);
            break;

        }

      }

      return primitive;

    }

    function groupPrimitives(primitives) {

      var build = {};

      for (var i = 0; i < primitives.length; i++) {

        var primitive = primitives[i];

        if (build[primitive.type] === undefined) build[primitive.type] = [];

        build[primitive.type].push(primitive);

      }

      return build;

    }

    function checkUVCoordinates(primitives) {

      var count = 0;

      for (var i = 0, l = primitives.length; i < l; i++) {

        var primitive = primitives[i];

        if (primitive.hasUV === true) {

          count++;

        }

      }

      if (count > 0 && count < primitives.length) {

        primitives.uvsNeedsFix = true;

      }

    }

    function buildGeometry(data) {

      var build = {};

      var sources = data.sources;
      var vertices = data.vertices;
      var primitives = data.primitives;

      if (primitives.length === 0) return {};

      // our goal is to create one buffer geometry for a single type of primitives
      // first, we group all primitives by their type

      var groupedPrimitives = groupPrimitives(primitives);

      for (var type in groupedPrimitives) {

        var primitiveType = groupedPrimitives[type];

        // second, ensure consistent uv coordinates for each type of primitives (polylist,triangles or lines)

        checkUVCoordinates(primitiveType);

        // third, create a buffer geometry for each type of primitives

        build[type] = buildGeometryType(primitiveType, sources, vertices);

      }

      return build;

    }

    function buildGeometryType(primitives, sources, vertices) {

      var build = {};

      var position = {array: [], stride: 0};
      var normal = {array: [], stride: 0};
      var uv = {array: [], stride: 0};
      var uv2 = {array: [], stride: 0};
      var color = {array: [], stride: 0};

      var skinIndex = {array: [], stride: 4};
      var skinWeight = {array: [], stride: 4};

      var geometry = new BufferGeometry();

      var materialKeys = [];

      var start = 0;

      for (var p = 0; p < primitives.length; p++) {

        var primitive = primitives[p];
        var inputs = primitive.inputs;

        // groups

        var count = 0;

        switch (primitive.type) {

          case 'lines':
          case 'linestrips':
            count = primitive.count * 2;
            break;

          case 'triangles':
            count = primitive.count * 3;
            break;

          case 'polylist':

            for (var g = 0; g < primitive.count; g++) {

              var vc = primitive.vcount[g];

              switch (vc) {

                case 3:
                  count += 3; // single triangle
                  break;

                case 4:
                  count += 6; // quad, subdivided into two triangles
                  break;

                default:
                  count += (vc - 2) * 3; // polylist with more than four vertices
                  break;

              }

            }

            break;

          default:
            console.warn('THREE.ColladaLoader: Unknow primitive type:', primitive.type);

        }

        geometry.addGroup(start, count, p);
        start += count;

        // material

        if (primitive.material) {

          materialKeys.push(primitive.material);

        }

        // geometry data

        for (var name in inputs) {

          var input = inputs[name];

          switch (name) {

            case 'VERTEX':
              for (var key in vertices) {

                var id = vertices[key];

                switch (key) {

                  case 'POSITION':
                    var prevLength = position.array.length;
                    buildGeometryData(primitive, sources[id], input.offset, position.array);
                    position.stride = sources[id].stride;

                    if (sources.skinWeights && sources.skinIndices) {

                      buildGeometryData(primitive, sources.skinIndices, input.offset, skinIndex.array);
                      buildGeometryData(primitive, sources.skinWeights, input.offset, skinWeight.array);

                    }

                    // see #3803

                    if (primitive.hasUV === false && primitives.uvsNeedsFix === true) {

                      var count = (position.array.length - prevLength) / position.stride;

                      for (var i = 0; i < count; i++) {

                        // fill missing uv coordinates

                        uv.array.push(0, 0);

                      }

                    }

                    break;

                  case 'NORMAL':
                    buildGeometryData(primitive, sources[id], input.offset, normal.array);
                    normal.stride = sources[id].stride;
                    break;

                  case 'COLOR':
                    buildGeometryData(primitive, sources[id], input.offset, color.array);
                    color.stride = sources[id].stride;
                    break;

                  case 'TEXCOORD':
                    buildGeometryData(primitive, sources[id], input.offset, uv.array);
                    uv.stride = sources[id].stride;
                    break;

                  case 'TEXCOORD1':
                    buildGeometryData(primitive, sources[id], input.offset, uv2.array);
                    uv.stride = sources[id].stride;
                    break;

                  default:
                    console.warn('THREE.ColladaLoader: Semantic "%s" not handled in geometry build process.', key);

                }

              }

              break;

            case 'NORMAL':
              buildGeometryData(primitive, sources[input.id], input.offset, normal.array);
              normal.stride = sources[input.id].stride;
              break;

            case 'COLOR':
              buildGeometryData(primitive, sources[input.id], input.offset, color.array);
              color.stride = sources[input.id].stride;
              break;

            case 'TEXCOORD':
              buildGeometryData(primitive, sources[input.id], input.offset, uv.array);
              uv.stride = sources[input.id].stride;
              break;

            case 'TEXCOORD1':
              buildGeometryData(primitive, sources[input.id], input.offset, uv2.array);
              uv2.stride = sources[input.id].stride;
              break;

          }

        }

      }

      // build geometry

      if (position.array.length > 0) geometry.setAttribute('position', new Float32BufferAttribute(position.array, position.stride));
      if (normal.array.length > 0) geometry.setAttribute('normal', new Float32BufferAttribute(normal.array, normal.stride));
      if (color.array.length > 0) geometry.setAttribute('color', new Float32BufferAttribute(color.array, color.stride));
      if (uv.array.length > 0) geometry.setAttribute('uv', new Float32BufferAttribute(uv.array, uv.stride));
      if (uv2.array.length > 0) geometry.setAttribute('uv2', new Float32BufferAttribute(uv2.array, uv2.stride));

      if (skinIndex.array.length > 0) geometry.setAttribute('skinIndex', new Float32BufferAttribute(skinIndex.array, skinIndex.stride));
      if (skinWeight.array.length > 0) geometry.setAttribute('skinWeight', new Float32BufferAttribute(skinWeight.array, skinWeight.stride));

      build.data = geometry;
      build.type = primitives[0].type;
      build.materialKeys = materialKeys;

      return build;

    }

    function buildGeometryData(primitive, source, offset, array) {

      var indices = primitive.p;
      var stride = primitive.stride;
      var vcount = primitive.vcount;

      function pushVector(i) {

        var index = indices[i + offset] * sourceStride;
        var length = index + sourceStride;

        for (; index < length; index++) {

          array.push(sourceArray[index]);

        }

      }

      var sourceArray = source.array;
      var sourceStride = source.stride;

      if (primitive.vcount !== undefined) {

        var index = 0;

        for (var i = 0, l = vcount.length; i < l; i++) {

          var count = vcount[i];

          if (count === 4) {

            var a = index + stride * 0;
            var b = index + stride * 1;
            var c = index + stride * 2;
            var d = index + stride * 3;

            pushVector(a);
            pushVector(b);
            pushVector(d);
            pushVector(b);
            pushVector(c);
            pushVector(d);

          } else if (count === 3) {

            var a = index + stride * 0;
            var b = index + stride * 1;
            var c = index + stride * 2;

            pushVector(a);
            pushVector(b);
            pushVector(c);

          } else if (count > 4) {

            for (var k = 1, kl = (count - 2); k <= kl; k++) {

              var a = index + stride * 0;
              var b = index + stride * k;
              var c = index + stride * (k + 1);

              pushVector(a);
              pushVector(b);
              pushVector(c);

            }

          }

          index += stride * count;

        }

      } else {

        for (var i = 0, l = indices.length; i < l; i += stride) {

          pushVector(i);

        }

      }

    }

    function getGeometry(id) {

      return getBuild(library.geometries[id], buildGeometry);

    }

    // kinematics

    function parseKinematicsModel(xml) {

      var data = {
        name: xml.getAttribute('name') || '',
        joints: {},
        links: []
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'technique_common':
            parseKinematicsTechniqueCommon(child, data);
            break;

        }

      }

      library.kinematicsModels[xml.getAttribute('id')] = data;

    }

    function buildKinematicsModel(data) {

      if (data.build !== undefined) return data.build;

      return data;

    }

    function getKinematicsModel(id) {

      return getBuild(library.kinematicsModels[id], buildKinematicsModel);

    }

    function parseKinematicsTechniqueCommon(xml, data) {

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'joint':
            data.joints[child.getAttribute('sid')] = parseKinematicsJoint(child);
            break;

          case 'link':
            data.links.push(parseKinematicsLink(child));
            break;

        }

      }

    }

    function parseKinematicsJoint(xml) {

      var data;

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'prismatic':
          case 'revolute':
            data = parseKinematicsJointParameter(child);
            break;

        }

      }

      return data;

    }

    function parseKinematicsJointParameter(xml, data) {

      var data = {
        sid: xml.getAttribute('sid'),
        name: xml.getAttribute('name') || '',
        axis: new Vector3(),
        limits: {
          min: 0,
          max: 0
        },
        type: xml.nodeName,
        static: false,
        zeroPosition: 0,
        middlePosition: 0
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'axis':
            var array = parseFloats(child.textContent);
            data.axis.fromArray(array);
            break;
          case 'limits':
            var max = child.getElementsByTagName('max')[0];
            var min = child.getElementsByTagName('min')[0];

            data.limits.max = parseFloat(max.textContent);
            data.limits.min = parseFloat(min.textContent);
            break;

        }

      }

      // if min is equal to or greater than max, consider the joint static

      if (data.limits.min >= data.limits.max) {

        data.static = true;

      }

      // calculate middle position

      data.middlePosition = (data.limits.min + data.limits.max) / 2.0;

      return data;

    }

    function parseKinematicsLink(xml) {

      var data = {
        sid: xml.getAttribute('sid'),
        name: xml.getAttribute('name') || '',
        attachments: [],
        transforms: []
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'attachment_full':
            data.attachments.push(parseKinematicsAttachment(child));
            break;

          case 'matrix':
          case 'translate':
          case 'rotate':
            data.transforms.push(parseKinematicsTransform(child));
            break;

        }

      }

      return data;

    }

    function parseKinematicsAttachment(xml) {

      var data = {
        joint: xml.getAttribute('joint').split('/').pop(),
        transforms: [],
        links: []
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'link':
            data.links.push(parseKinematicsLink(child));
            break;

          case 'matrix':
          case 'translate':
          case 'rotate':
            data.transforms.push(parseKinematicsTransform(child));
            break;

        }

      }

      return data;

    }

    function parseKinematicsTransform(xml) {

      var data = {
        type: xml.nodeName
      };

      var array = parseFloats(xml.textContent);

      switch (data.type) {

        case 'matrix':
          data.obj = new Matrix4();
          data.obj.fromArray(array).transpose();
          break;

        case 'translate':
          data.obj = new Vector3();
          data.obj.fromArray(array);
          break;

        case 'rotate':
          data.obj = new Vector3();
          data.obj.fromArray(array);
          data.angle = MathUtils.degToRad(array[3]);
          break;

      }

      return data;

    }

    // physics

    function parsePhysicsModel(xml) {

      var data = {
        name: xml.getAttribute('name') || '',
        rigidBodies: {}
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'rigid_body':
            data.rigidBodies[child.getAttribute('name')] = {};
            parsePhysicsRigidBody(child, data.rigidBodies[child.getAttribute('name')]);
            break;

        }

      }

      library.physicsModels[xml.getAttribute('id')] = data;

    }

    function parsePhysicsRigidBody(xml, data) {

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'technique_common':
            parsePhysicsTechniqueCommon(child, data);
            break;

        }

      }

    }

    function parsePhysicsTechniqueCommon(xml, data) {

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'inertia':
            data.inertia = parseFloats(child.textContent);
            break;

          case 'mass':
            data.mass = parseFloats(child.textContent)[0];
            break;

        }

      }

    }

    // scene

    function parseKinematicsScene(xml) {

      var data = {
        bindJointAxis: []
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'bind_joint_axis':
            data.bindJointAxis.push(parseKinematicsBindJointAxis(child));
            break;

        }

      }

      library.kinematicsScenes[parseId(xml.getAttribute('url'))] = data;

    }

    function parseKinematicsBindJointAxis(xml) {

      var data = {
        target: xml.getAttribute('target').split('/').pop()
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'axis':
            var param = child.getElementsByTagName('param')[0];
            data.axis = param.textContent;
            var tmpJointIndex = data.axis.split('inst_').pop().split('axis')[0];
            data.jointIndex = tmpJointIndex.substr(0, tmpJointIndex.length - 1);
            break;

        }

      }

      return data;

    }

    function buildKinematicsScene(data) {

      if (data.build !== undefined) return data.build;

      return data;

    }

    function getKinematicsScene(id) {

      return getBuild(library.kinematicsScenes[id], buildKinematicsScene);

    }

    function setupKinematics() {

      var kinematicsModelId = Object.keys(library.kinematicsModels)[0];
      var kinematicsSceneId = Object.keys(library.kinematicsScenes)[0];
      var visualSceneId = Object.keys(library.visualScenes)[0];

      if (kinematicsModelId === undefined || kinematicsSceneId === undefined) return;

      var kinematicsModel = getKinematicsModel(kinematicsModelId);
      var kinematicsScene = getKinematicsScene(kinematicsSceneId);
      var visualScene = getVisualScene(visualSceneId);

      var bindJointAxis = kinematicsScene.bindJointAxis;
      var jointMap = {};

      for (var i = 0, l = bindJointAxis.length; i < l; i++) {

        var axis = bindJointAxis[i];

        // the result of the following query is an element of type 'translate', 'rotate','scale' or 'matrix'

        var targetElement = collada.querySelector('[sid="' + axis.target + '"]');

        if (targetElement) {

          // get the parent of the transform element

          var parentVisualElement = targetElement.parentElement;

          // connect the joint of the kinematics model with the element in the visual scene

          connect(axis.jointIndex, parentVisualElement);

        }

      }

      function connect(jointIndex, visualElement) {

        var visualElementName = visualElement.getAttribute('name');
        var joint = kinematicsModel.joints[jointIndex];

        visualScene.traverse(function (object) {

          if (object.name === visualElementName) {

            jointMap[jointIndex] = {
              object: object,
              transforms: buildTransformList(visualElement),
              joint: joint,
              position: joint.zeroPosition
            };

          }

        });

      }

      var m0 = new Matrix4();

      kinematics = {

        joints: kinematicsModel && kinematicsModel.joints,

        getJointValue: function (jointIndex) {

          var jointData = jointMap[jointIndex];

          if (jointData) {

            return jointData.position;

          } else {

            console.warn('THREE.ColladaLoader: Joint ' + jointIndex + ' doesn\'t exist.');

          }

        },

        setJointValue: function (jointIndex, value) {

          var jointData = jointMap[jointIndex];

          if (jointData) {

            var joint = jointData.joint;

            if (value > joint.limits.max || value < joint.limits.min) {

              console.warn('THREE.ColladaLoader: Joint ' + jointIndex + ' value ' + value + ' outside of limits (min: ' + joint.limits.min + ', max: ' + joint.limits.max + ').');

            } else if (joint.static) {

              console.warn('THREE.ColladaLoader: Joint ' + jointIndex + ' is static.');

            } else {

              var object = jointData.object;
              var axis = joint.axis;
              var transforms = jointData.transforms;

              matrix.identity();

              // each update, we have to apply all transforms in the correct order

              for (var i = 0; i < transforms.length; i++) {

                var transform = transforms[i];

                // if there is a connection of the transform node with a joint, apply the joint value

                if (transform.sid && transform.sid.indexOf(jointIndex) !== -1) {

                  switch (joint.type) {

                    case 'revolute':
                      matrix.multiply(m0.makeRotationAxis(axis, MathUtils.degToRad(value)));
                      break;

                    case 'prismatic':
                      matrix.multiply(m0.makeTranslation(axis.x * value, axis.y * value, axis.z * value));
                      break;

                    default:
                      console.warn('THREE.ColladaLoader: Unknown joint type: ' + joint.type);
                      break;

                  }

                } else {

                  switch (transform.type) {

                    case 'matrix':
                      matrix.multiply(transform.obj);
                      break;

                    case 'translate':
                      matrix.multiply(m0.makeTranslation(transform.obj.x, transform.obj.y, transform.obj.z));
                      break;

                    case 'scale':
                      matrix.scale(transform.obj);
                      break;

                    case 'rotate':
                      matrix.multiply(m0.makeRotationAxis(transform.obj, transform.angle));
                      break;

                  }

                }

              }

              object.matrix.copy(matrix);
              object.matrix.decompose(object.position, object.quaternion, object.scale);

              jointMap[jointIndex].position = value;

            }

          } else {

            console.log('THREE.ColladaLoader: ' + jointIndex + ' does not exist.');

          }

        }

      };

    }

    function buildTransformList(node) {

      var transforms = [];

      var xml = collada.querySelector('[id="' + node.id + '"]');

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'matrix':
            var array = parseFloats(child.textContent);
            var matrix = new Matrix4().fromArray(array).transpose();
            transforms.push({
              sid: child.getAttribute('sid'),
              type: child.nodeName,
              obj: matrix
            });
            break;

          case 'translate':
          case 'scale':
            var array = parseFloats(child.textContent);
            var vector = new Vector3().fromArray(array);
            transforms.push({
              sid: child.getAttribute('sid'),
              type: child.nodeName,
              obj: vector
            });
            break;

          case 'rotate':
            var array = parseFloats(child.textContent);
            var vector = new Vector3().fromArray(array);
            var angle = MathUtils.degToRad(array[3]);
            transforms.push({
              sid: child.getAttribute('sid'),
              type: child.nodeName,
              obj: vector,
              angle: angle
            });
            break;

        }

      }

      return transforms;

    }

    // nodes

    function prepareNodes(xml) {

      var elements = xml.getElementsByTagName('node');

      // ensure all node elements have id attributes

      for (var i = 0; i < elements.length; i++) {

        var element = elements[i];

        if (element.hasAttribute('id') === false) {

          element.setAttribute('id', generateId());

        }

      }

    }

    var matrix = new Matrix4();
    var vector = new Vector3();

    function parseNode(xml) {

      var data = {
        name: xml.getAttribute('name') || '',
        type: xml.getAttribute('type'),
        id: xml.getAttribute('id'),
        sid: xml.getAttribute('sid'),
        matrix: new Matrix4(),
        nodes: [],
        instanceCameras: [],
        instanceControllers: [],
        instanceLights: [],
        instanceGeometries: [],
        instanceNodes: [],
        transforms: {}
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        if (child.nodeType !== 1) continue;

        switch (child.nodeName) {

          case 'node':
            data.nodes.push(child.getAttribute('id'));
            parseNode(child);
            break;

          case 'instance_camera':
            data.instanceCameras.push(parseId(child.getAttribute('url')));
            break;

          case 'instance_controller':
            data.instanceControllers.push(parseNodeInstance(child));
            break;

          case 'instance_light':
            data.instanceLights.push(parseId(child.getAttribute('url')));
            break;

          case 'instance_geometry':
            data.instanceGeometries.push(parseNodeInstance(child));
            break;

          case 'instance_node':
            data.instanceNodes.push(parseId(child.getAttribute('url')));
            break;

          case 'matrix':
            var array = parseFloats(child.textContent);
            data.matrix.multiply(matrix.fromArray(array).transpose());
            data.transforms[child.getAttribute('sid')] = child.nodeName;
            break;

          case 'translate':
            var array = parseFloats(child.textContent);
            vector.fromArray(array);
            data.matrix.multiply(matrix.makeTranslation(vector.x, vector.y, vector.z));
            data.transforms[child.getAttribute('sid')] = child.nodeName;
            break;

          case 'rotate':
            var array = parseFloats(child.textContent);
            var angle = MathUtils.degToRad(array[3]);
            data.matrix.multiply(matrix.makeRotationAxis(vector.fromArray(array), angle));
            data.transforms[child.getAttribute('sid')] = child.nodeName;
            break;

          case 'scale':
            var array = parseFloats(child.textContent);
            data.matrix.scale(vector.fromArray(array));
            data.transforms[child.getAttribute('sid')] = child.nodeName;
            break;

          case 'extra':
            break;

          default:
            console.log(child);

        }

      }

      if (hasNode(data.id)) {

        console.warn('THREE.ColladaLoader: There is already a node with ID %s. Exclude current node from further processing.', data.id);

      } else {

        library.nodes[data.id] = data;

      }

      return data;

    }

    function parseNodeInstance(xml) {

      var data = {
        id: parseId(xml.getAttribute('url')),
        materials: {},
        skeletons: []
      };

      for (var i = 0; i < xml.childNodes.length; i++) {

        var child = xml.childNodes[i];

        switch (child.nodeName) {

          case 'bind_material':
            var instances = child.getElementsByTagName('instance_material');

            for (var j = 0; j < instances.length; j++) {

              var instance = instances[j];
              var symbol = instance.getAttribute('symbol');
              var target = instance.getAttribute('target');

              data.materials[symbol] = parseId(target);

            }

            break;

          case 'skeleton':
            data.skeletons.push(parseId(child.textContent));
            break;

          default:
            break;

        }

      }

      return data;

    }

    function buildSkeleton(skeletons, joints) {

      var boneData = [];
      var sortedBoneData = [];

      var i, j, data;

      // a skeleton can have multiple root bones. collada expresses this
      // situtation with multiple "skeleton" tags per controller instance

      for (i = 0; i < skeletons.length; i++) {

        var skeleton = skeletons[i];

        var root;

        if (hasNode(skeleton)) {

          root = getNode(skeleton);
          buildBoneHierarchy(root, joints, boneData);

        } else if (hasVisualScene(skeleton)) {

          // handle case where the skeleton refers to the visual scene (#13335)

          var visualScene = library.visualScenes[skeleton];
          var children = visualScene.children;

          for (var j = 0; j < children.length; j++) {

            var child = children[j];

            if (child.type === 'JOINT') {

              var root = getNode(child.id);
              buildBoneHierarchy(root, joints, boneData);

            }

          }

        } else {

          console.error('THREE.ColladaLoader: Unable to find root bone of skeleton with ID:', skeleton);

        }

      }

      // sort bone data (the order is defined in the corresponding controller)

      for (i = 0; i < joints.length; i++) {

        for (j = 0; j < boneData.length; j++) {

          data = boneData[j];

          if (data.bone.name === joints[i].name) {

            sortedBoneData[i] = data;
            data.processed = true;
            break;

          }

        }

      }

      // add unprocessed bone data at the end of the list

      for (i = 0; i < boneData.length; i++) {

        data = boneData[i];

        if (data.processed === false) {

          sortedBoneData.push(data);
          data.processed = true;

        }

      }

      // setup arrays for skeleton creation

      var bones = [];
      var boneInverses = [];

      for (i = 0; i < sortedBoneData.length; i++) {

        data = sortedBoneData[i];

        bones.push(data.bone);
        boneInverses.push(data.boneInverse);

      }

      return new Skeleton(bones, boneInverses);

    }

    function buildBoneHierarchy(root, joints, boneData) {

      // setup bone data from visual scene

      root.traverse(function (object) {

        if (object.isBone === true) {

          var boneInverse;

          // retrieve the boneInverse from the controller data

          for (var i = 0; i < joints.length; i++) {

            var joint = joints[i];

            if (joint.name === object.name) {

              boneInverse = joint.boneInverse;
              break;

            }

          }

          if (boneInverse === undefined) {

            // Unfortunately, there can be joints in the visual scene that are not part of the
            // corresponding controller. In this case, we have to create a dummy boneInverse matrix
            // for the respective bone. This bone won't affect any vertices, because there are no skin indices
            // and weights defined for it. But we still have to add the bone to the sorted bone list in order to
            // ensure a correct animation of the model.

            boneInverse = new Matrix4();

          }

          boneData.push({bone: object, boneInverse: boneInverse, processed: false});

        }

      });

    }

    function buildNode(data) {

      var objects = [];

      var matrix = data.matrix;
      var nodes = data.nodes;
      var type = data.type;
      var instanceCameras = data.instanceCameras;
      var instanceControllers = data.instanceControllers;
      var instanceLights = data.instanceLights;
      var instanceGeometries = data.instanceGeometries;
      var instanceNodes = data.instanceNodes;

      // nodes

      for (var i = 0, l = nodes.length; i < l; i++) {

        objects.push(getNode(nodes[i]));

      }

      // instance cameras

      for (var i = 0, l = instanceCameras.length; i < l; i++) {

        var instanceCamera = getCamera(instanceCameras[i]);

        if (instanceCamera !== null) {

          objects.push(instanceCamera.clone());

        }

      }

      // instance controllers

      for (var i = 0, l = instanceControllers.length; i < l; i++) {

        var instance = instanceControllers[i];
        var controller = getController(instance.id);
        var geometries = getGeometry(controller.id);
        var newObjects = buildObjects(geometries, instance.materials);

        var skeletons = instance.skeletons;
        var joints = controller.skin.joints;

        var skeleton = buildSkeleton(skeletons, joints);

        for (var j = 0, jl = newObjects.length; j < jl; j++) {

          var object = newObjects[j];

          if (object.isSkinnedMesh) {

            object.bind(skeleton, controller.skin.bindMatrix);
            object.normalizeSkinWeights();

          }

          objects.push(object);

        }

      }

      // instance lights

      for (var i = 0, l = instanceLights.length; i < l; i++) {

        var instanceLight = getLight(instanceLights[i]);

        if (instanceLight !== null) {

          objects.push(instanceLight.clone());

        }

      }

      // instance geometries

      for (var i = 0, l = instanceGeometries.length; i < l; i++) {

        var instance = instanceGeometries[i];

        // a single geometry instance in collada can lead to multiple object3Ds.
        // this is the case when primitives are combined like triangles and lines

        var geometries = getGeometry(instance.id);
        var newObjects = buildObjects(geometries, instance.materials);

        for (var j = 0, jl = newObjects.length; j < jl; j++) {

          objects.push(newObjects[j]);

        }

      }

      // instance nodes

      for (var i = 0, l = instanceNodes.length; i < l; i++) {

        objects.push(getNode(instanceNodes[i]).clone());

      }

      var object;

      if (nodes.length === 0 && objects.length === 1) {

        object = objects[0];

      } else {

        object = (type === 'JOINT') ? new Bone() : new Group();

        for (var i = 0; i < objects.length; i++) {

          object.add(objects[i]);

        }

      }

      object.name = (type === 'JOINT') ? data.sid : data.name;
      object.matrix.copy(matrix);
      object.matrix.decompose(object.position, object.quaternion, object.scale);

      return object;

    }

    var fallbackMaterial = new MeshBasicMaterial({color: 0xff00ff});

    function resolveMaterialBinding(keys, instanceMaterials) {

      var materials = [];

      for (var i = 0, l = keys.length; i < l; i++) {

        var id = instanceMaterials[keys[i]];

        if (id === undefined) {

          console.warn('THREE.ColladaLoader: Material with key %s not found. Apply fallback material.', keys[i]);
          materials.push(fallbackMaterial);

        } else {

          materials.push(getMaterial(id));

        }

      }

      return materials;

    }

    function buildObjects(geometries, instanceMaterials) {

      var objects = [];

      for (var type in geometries) {

        var geometry = geometries[type];

        var materials = resolveMaterialBinding(geometry.materialKeys, instanceMaterials);

        // handle case if no materials are defined

        if (materials.length === 0) {

          if (type === 'lines' || type === 'linestrips') {

            materials.push(new LineBasicMaterial());

          } else {

            materials.push(new MeshPhongMaterial());

          }

        }

        // regard skinning

        var skinning = (geometry.data.attributes.skinIndex !== undefined);

        if (skinning) {

          for (var i = 0, l = materials.length; i < l; i++) {

            materials[i].skinning = true;

          }

        }

        // choose between a single or multi materials (material array)

        var material = (materials.length === 1) ? materials[0] : materials;

        // now create a specific 3D object

        var object;

        switch (type) {

          case 'lines':
            object = new LineSegments(geometry.data, material);
            break;

          case 'linestrips':
            object = new Line(geometry.data, material);
            break;

          case 'triangles':
          case 'polylist':
            if (skinning) {

              object = new SkinnedMesh(geometry.data, material);

            } else {

              object = new Mesh(geometry.data, material);

            }

            break;

        }

        objects.push(object);

      }

      return objects;

    }

    function hasNode(id) {

      return library.nodes[id] !== undefined;

    }

    function getNode(id) {

      return getBuild(library.nodes[id], buildNode);

    }

    // visual scenes

    function parseVisualScene(xml) {

      var data = {
        name: xml.getAttribute('name'),
        children: []
      };

      prepareNodes(xml);

      var elements = getElementsByTagName(xml, 'node');

      for (var i = 0; i < elements.length; i++) {

        data.children.push(parseNode(elements[i]));

      }

      library.visualScenes[xml.getAttribute('id')] = data;

    }

    function buildVisualScene(data) {

      var group = new Group();
      group.name = data.name;

      var children = data.children;

      for (var i = 0; i < children.length; i++) {

        var child = children[i];

        group.add(getNode(child.id));

      }

      return group;

    }

    function hasVisualScene(id) {

      return library.visualScenes[id] !== undefined;

    }

    function getVisualScene(id) {

      return getBuild(library.visualScenes[id], buildVisualScene);

    }

    // scenes

    function parseScene(xml) {

      var instance = getElementsByTagName(xml, 'instance_visual_scene')[0];
      return getVisualScene(parseId(instance.getAttribute('url')));

    }

    function setupAnimations() {

      var clips = library.clips;

      if (isEmpty(clips) === true) {

        if (isEmpty(library.animations) === false) {

          // if there are animations but no clips, we create a default clip for playback

          var tracks = [];

          for (var id in library.animations) {

            var animationTracks = getAnimation(id);

            for (var i = 0, l = animationTracks.length; i < l; i++) {

              tracks.push(animationTracks[i]);

            }

          }

          animations.push(new AnimationClip('default', -1, tracks));

        }

      } else {

        for (var id in clips) {

          animations.push(getAnimationClip(id));

        }

      }

    }

    // convert the parser error element into text with each child elements text
    // separated by new lines.

    function parserErrorToText(parserError) {

      var result = '';
      var stack = [parserError];

      while (stack.length) {

        var node = stack.shift();

        if (node.nodeType === Node.TEXT_NODE) {

          result += node.textContent;

        } else {

          result += '\n';
          stack.push.apply(stack, node.childNodes);

        }

      }

      return result.trim();

    }

    if (text.length === 0) {

      return {scene: new Scene()};

    }

    var xml = new DOMParser().parseFromString(text, 'application/xml');

    var collada = getElementsByTagName(xml, 'COLLADA')[0];

    var parserError = xml.getElementsByTagName('parsererror')[0];
    if (parserError !== undefined) {

      // Chrome will return parser error with a div in it

      var errorElement = getElementsByTagName(parserError, 'div')[0];
      var errorText;

      if (errorElement) {

        errorText = errorElement.textContent;

      } else {

        errorText = parserErrorToText(parserError);

      }

      console.error('THREE.ColladaLoader: Failed to parse collada file.\n', errorText);

      return null;

    }

    // metadata

    var version = collada.getAttribute('version');
    console.log('THREE.ColladaLoader: File version', version);

    var asset = parseAsset(getElementsByTagName(collada, 'asset')[0]);
    var textureLoader = new TextureLoader(this.manager);
    textureLoader.setPath(this.resourcePath || path).setCrossOrigin(this.crossOrigin);

    var tgaLoader;

    if (TGALoader) {

      tgaLoader = new TGALoader(this.manager);
      tgaLoader.setPath(this.resourcePath || path);

    }

    //

    var animations = [];
    var kinematics = {};
    var count = 0;

    //

    var library = {
      animations: {},
      clips: {},
      controllers: {},
      images: {},
      effects: {},
      materials: {},
      cameras: {},
      lights: {},
      geometries: {},
      nodes: {},
      visualScenes: {},
      kinematicsModels: {},
      physicsModels: {},
      kinematicsScenes: {}
    };

    parseLibrary(collada, 'library_animations', 'animation', parseAnimation);
    parseLibrary(collada, 'library_animation_clips', 'animation_clip', parseAnimationClip);
    parseLibrary(collada, 'library_controllers', 'controller', parseController);
    parseLibrary(collada, 'library_images', 'image', parseImage);
    parseLibrary(collada, 'library_effects', 'effect', parseEffect);
    parseLibrary(collada, 'library_materials', 'material', parseMaterial);
    parseLibrary(collada, 'library_cameras', 'camera', parseCamera);
    parseLibrary(collada, 'library_lights', 'light', parseLight);
    parseLibrary(collada, 'library_geometries', 'geometry', parseGeometry);
    parseLibrary(collada, 'library_nodes', 'node', parseNode);
    parseLibrary(collada, 'library_visual_scenes', 'visual_scene', parseVisualScene);
    parseLibrary(collada, 'library_kinematics_models', 'kinematics_model', parseKinematicsModel);
    parseLibrary(collada, 'library_physics_models', 'physics_model', parsePhysicsModel);
    parseLibrary(collada, 'scene', 'instance_kinematics_scene', parseKinematicsScene);

    buildLibrary(library.animations, buildAnimation);
    buildLibrary(library.clips, buildAnimationClip);
    buildLibrary(library.controllers, buildController);
    buildLibrary(library.images, buildImage);
    buildLibrary(library.effects, buildEffect);
    buildLibrary(library.materials, buildMaterial);
    buildLibrary(library.cameras, buildCamera);
    buildLibrary(library.lights, buildLight);
    buildLibrary(library.geometries, buildGeometry);
    buildLibrary(library.visualScenes, buildVisualScene);

    setupAnimations();
    setupKinematics();

    var scene = parseScene(getElementsByTagName(collada, 'scene')[0]);

    if (asset.upAxis === 'Z_UP') {

      scene.quaternion.setFromEuler(new Euler(-Math.PI / 2, 0, 0));

    }

    scene.scale.multiplyScalar(asset.unit);

    return {
      animations: animations,
      kinematics: kinematics,
      library: library,
      scene: scene
    };

  }

});

export {ColladaLoader};
